[JJ_SO]

Sorry to use your thread for debating Sigma dp 0 or dp 1 stuff. First: I would be mad to use any Sigma camera for video - that's pointless.

 

Second: talking of "blotches", I just want to be sure you mean these stuff here:



 

At 500% enlargement

at f/4 = wide open

in the top right corner

 

Please, any of the flaw seekers, deliver a picture with a 21 mm FF lens at f/4 in backlight or better, a 14 mm lens APSC at f/4. I checked my library, but could not find an f/4 at 14 or 21 mm which was absolutely free of purple in the corners - plus, definitively less sharp.

Backlit. Top left or right. I'm looking forward to it. Also, to the master of printing these "blotches". 

 

Now, the diff between lens profile ON/OFF, best visible with a DP1 (19 mm), because that's the weakest lens of the old Merrill series:



 

Full res here

 

Here's ON



 

 

And here's OFF



 
Noticeable and visible - but no big deal. I suspect, it was OFF at the sample picture.
 
What I like is that kind of stuff:

 

And the 100% crop



 

Anybody calling it "fake sharpness" is highly welcome to show "true sharpness".